This is such a classic. It's the kind of recipe that takes me straight to a French bistro. Pair it with a salad of radicchio or any bitter greens and a glass of dry white wine and I would call it the finest meal. I also eat leftover quiche warmed gently in the toaster oven. You can use a store-bought crust to save time. Also, my mom always puts a dash of hot sauce in the batter to give it a little kick. Try it.
For the dough: Preheat the oven to 350 degrees F. Butter a 9-inch pie plate and set aside.
Pulse the flour and salt in a food processor to blend. Pulse in the egg yolks and butter. (Do not overmix.) Add the ice water through the top and pulse until the dough comes together and forms a loose ball. Turn the dough onto a floured surface.
Place the dough between two sheets of parchment paper. Roll into a round, about 10 inches in diameter. Press the dough gently into the bottom and up the sides of the prepared pie plate. Ideally, there should be about an inch of excess dough hanging over the edge. Pinch the dough up to create a crimped edge. Place one sheet of parchment over the dough and fill with pie weights. Bake until lightly brown, 16 to 18 minutes. Remove the parchment paper and pie weights and let cool.
For the quiche custard: Cook the lardons in a skillet until crispy, 5 to 8 minutes. Set aside.
Whisk together the eggs, half-and-half, milk, nutmeg, hot sauce, Worcestershire, salt and pepper in a large bowl. Stir in the cheeses.
Place the pie shell on a rimmed baking sheet. Scatter three-quarters of the bacon over the shell, then pour the custard over the top. Bake until set and brown and bubbly on top, 25 to 30 minutes. Garnish with the remaining bacon and chives. Slice and serve.